﻿// Copyright (c) 2012 Francis Xavier Joseph Pulikotil
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

using System;

namespace Daabli
{
    public interface IReadable<T>
    {
        bool Read(Reader r);
    }

    public class ObjectReader<T> : IObjectReader
        where T : IReadable<T>
    {
        // Members
        private Grouping _grouping = Grouping.Optional;

        // IObjectReader properties
        public Type Type { get { return typeof(T); } }
        public Grouping Grouping { get { return _grouping; } }

        // Constructors
        public ObjectReader()
        {
        }
        public ObjectReader(Grouping grouping)
        {
            _grouping = grouping;
        }

        // IObjectReader functions
        public object Read(object obj, Reader r)
        {
            var readable = obj as IReadable<T>;
            if (readable == null)
            {
                r.Log.Write(MessageType.InternalError, "object is not IReadable<{0}>", Type.ToString());
                return null;
            }

            if (!readable.Read(r))
                return null;

            return obj;
        }
    }
}
